Event-Driven Architecture (EDA)
A software design pattern where state changes or user interactions trigger real-time asynchronous event flows across decoupled systems and microservices.
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Exponential Backoff
An algorithm that handles temporary API outages or rate limits by retrying failed event submissions with exponentially increasing delay intervals.
Idempotency
A critical property of API endpoints ensuring that receiving duplicate event requests with the same parameters produces the exact same result without creating duplicate records.
Latency vs. Throughput
The trade-off between the time taken for a single event to travel from source to destination (Latency) and the total volume of event payloads a system can process per second (Throughput).
Observability & Monitoring
The practice of tracking real-time metrics, error rates (HTTP 4xx/5xx), latency spikes, and system health across every stage of a data pipeline.
Retry Mechanism
An automated resilience pattern designed to resend failed HTTP requests or API calls under specific transient failure conditions (e.g., network timeouts or 503 errors).
Churn rate
Churn rate, also known as the rate of attrition or customer churn, is a metric that measures the rate at which customers stop doing business with an entity within a specific period. This can be applied to various scenarios:
CAC – cost acquisition client
Customer Acquisition Cost (CAC) is a key business metric that measures the average cost a company incurs to acquire a new customer. It includes all costs associated with sales and marketing efforts, such as advertising expenses, salaries, commissions, bonuses,
CPV – cost per view
A bid method for video campaigns where you pay per view. A view counts when a viewer watches 30 seconds of your video ad (or the duration if it’s shorter than 30 seconds) or interacts with the ad, whichever comes first.
CPM (cost per mile)
Cost per Mille, CPM) — часто используемая модель рекламы в интернет-маркетинге, под которой понимается стоимость охвата тысячи пользователей или стоимость тысячи просмотров.